each session is ideally going to have 20 people max. we wanted to keep things relatively small, so nothing felt rushed. the sessions will be recorded and Music Hackspace will offer access to them afterwards.
if you don’t have one in mind already, it might be helpful to hold off until you get a sense of what you want your interactions to look/feel like. other folks in the sessions might have advice, as well 
on Mac, I usually just create an aggregate audio device in the Audio MIDI Setup app that bundles up all of my audio sources. then in Zoom, I choose that device as my input and it’s usually good to go – i’ll see if Music Hackspace has any additional tips, tho!
oh, i’m so glad! i was going to mention that anyone who takes the first session will walk away with the tools needed to dig into the second session, so feel free to double-up!
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